如何在两个线程之间实时更新共享的布尔变量？

我正在尝试调用线程以使用循环播放声音。看来可以打电话玩了。

但是，我希望能够允许用户单击“暂停”按钮时退出循环。我已经设置了布尔变量“ PauseClicked”以允许这样做。

我想遇到的问题-我不知道如何从主线程更新“ PauseClicked”变量。您知道在循环运行时如何同时从主线程更新此变量吗？

您能提供的任何帮助将不胜感激。我花了很多时间在此上。我不确定的特定代码如下（更新变量的尝试在最后第三行）：

// Import statements
 public class MyActivity extends Activity {
 boolean PauseClicked = false;

 // .... Other variables and onCreate....


    public void whenPlayClicked(View view) {
        new LongOperation().execute("");

    }

    private class LongOperation extends AsyncTask<String, Void, String> {

 @Override
        protected String doInBackground(String... params) {

            //Setup playing variables
            AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
            float curVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
            float maxVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
            float leftVolume = curVolume / maxVolume;
            float rightVolume = curVolume / maxVolume;
            int priority = 1;
            int no_loop = 0;
            float normal_playback_rate = 1f;

            //temporary sleep counters
            int blueSleep = (BlueCount * 1000);
            int greenSleep = (GreenCount * 1000);
            int redSleep = (RedCount * 1000);
            int orangeSleep = (OrangeCount * 1000);
            int bellSleep = 4000;
            int cyclesPlayed = 0;

            // Loop - loop until either 1) all cycles have been played. (i.e repeat number of times selected from Spinner).
            //  or 2)Pause button is clicked.
            for (PauseClicked = false; (cyclesPlayed < cycleCount) && (PauseClicked == false); cyclesPlayed++) {
                if (blueSleep > 0) {
                    soundPool.play(blueSoundID, leftVolume, rightVolume, priority, no_loop, normal_playback_rate);
                    SystemClock.sleep(blueSleep);
                }

                if (greenSleep > 0) {
                    soundPool.play(greenSoundID, leftVolume, rightVolume, priority, no_loop, normal_playback_rate);
                    SystemClock.sleep(greenSleep);
                }

                if (redSleep > 0) {
                    soundPool.play(redSoundID, leftVolume, rightVolume, priority, no_loop, normal_playback_rate);
                    SystemClock.sleep(redSleep);
                }

                if (orangeSleep > 0) {
                    soundPool.play(orangeSoundID, leftVolume, rightVolume, priority, no_loop, normal_playback_rate);
                    SystemClock.sleep(orangeSleep);
                }
          //      CheckForPause();
            }

            if (TotCount > 0) {
                SystemClock.sleep(bellSleep);
                soundPool.play(bellSoundID, 0.05F, 0.05F, priority, no_loop, normal_playback_rate);
                SystemClock.sleep(bellSleep);
            }
            return null;
        }

        @Override
        protected void onPostExecute(String result) {
            textView2.setText("We are returning from call to ASynch task.");
        }

        @Override
        protected void onPreExecute() {}

        @Override
        protected void onProgressUpdate(Void... values) {}
    }


    public void whenPauseClicked(View view) {
        Toast.makeText(getApplicationContext(), "All sounds were paused", Toast.LENGTH_SHORT).show();
        PauseClicked = true;
        soundPool.autoPause();
    }